that will do it as well. the head unit on them is a big difference. there are three different stereo levels (AS1, AS2, AS3/HK). since you have a sedan your car will have the 9 speaker system with 2 speakers on the rear deck. whereas in the wagons they use just one subwoofer located in the back, which i dont think says HK on it anywhere.

I say turn the bass and treble up approx. 3/4 max. Then pop in a Led Zeppelin CD (preferably "IV") and recline the leather seat back and set volume to MAX. If you have the Harmon Karden system there will be no mistaking its clear, crisp sound along with a thumping you can feel with every one of Jon Bonham's bass drum kicks!! The other systems you will hear crackling noises and jibberish.....